Sewing-machine.



M. TIDENNE. SEWING MACHINE. APPLICATION FILED SEPT. 22, 1914.

Patented Apr. 22, 1919.

3 SHEETS-SHEET I.

e 3 m m A n f 08 & Tnmnu 9% mm M m MW WiInesses.

M. -T. DENNE. sgwme MACHINE. APPLICATION men SEPT; 22. 1914,

a SHEETS-SHEET 3 MurK T. D e n ne WWW kW A'ITys.

Patented Apr. 22,1919.

MARK THOMAS DENNE, 0F RUSHDEN, ENGLAND.

SEWING-MACHINE.

To all whom it may concern Be it known that I, MARK THOMAS DENNE, a subject of the King of Great Britain and Ireland, residing at Rushd'en, Northamptonshire, England, have invented new and useful Improvements in and Relating to Sewing-Machines, of Which the following is a specification.

This invention has reference to improvements in sewing machines of the type known as outsole stitchers, used for stitching the outsole to the welt or to the middle sole of boots or shoes and in which a curved needle and a curved awl are employed, and it comprises the combination with the stitch-forming mechanism of such machines of threadmeasuring means controlled by the presser foot and comprising a pivotally-mountedpull-off lever coupled on the one hand to the presser foot and on the other hand to the take-up lever by slotted links to draw oil a length of thread for each stitch proportional to the thickness of the work. It also comprises the combination with the stitch-forming mechanism, of a presser foot and means hereinafter described under the control of the operator to control the clamping force of the presser foot and the amount of the lift thereof.

An embodiment of my invention is illus- 'trated in the accompanying drawings, 1n

which- Figure 1 is a side elevation of the head of a machine embodying my invention;

Fig. 2 is an end elevation of the presserfoot-actuating means;

Fig. 3 is a side elevation of the same, partly in section; 1

Figs. 4 and 5 are end and side views, respectively, of the thread-measuring means,

Fig. 6 shows a detail of same.

Referring tothe said drawings, 1 indicates the head of the machine and 1 is a cam shaft on which the necessary cams or cam cylinder for operating the mechanism of the machine are or is mounted in an oiltight casing 2.

1 indicates a curved needle whlch is carried by an oscillating needle stock or segment 7 which is provided with gear teeth that mesh with teeth formed on the end of a needle-operating lever- 9, and 8 indi-- cates an oscillating awl stock or carrier which is provided with gear teeth that mesh with teeth formed on an awl-operating lever Specification of Letters Patent. Patented Apr, 22, 1919,

Application filed September 22, 1914. Serial No. 863,025.

10. These levers 9 and 10 are actuated from cams carried by the cam shaft 1*.

In accordance with the invention the presser-foot or channel guide 28 is carried on an arm of a lever 29 mounted on a sleeve forming part of the needle and awl pivot. The lever 29 gears with a lever 30 carried on a suitable shaft 31 on which a handle is fixed whereby the operator may raise the presser foot 2-8 to enable him to insert or remove the work. The lever 30 referred to has a second gear segment which meshes with a pinion 33 forming part of or mounted on a shaft 3 1, on which is also mounted a toothed or ratchet wheel 35 and which shaft is carried by a rocking lever.

On the spindle or shaft 31 on which the handle referred to is mounted and supported in bearings in the machine frame or head and free to rock is a sleeve 36 the said rocking movement of which is derived from a camlever 38 through the intermediary of a lever 37 mounted on said sleeve. When the sleeve 36 is rocked it imparts movement to a rocking lever 39 in which the spindle 34: carrying the toothed pinion 33 and the ratchet wheel 35 is mounted.

Mounted loosely on the sleeve 36 is a plate #10 carrying two pawls 11, 42 one or other of which may be in engagement with the ratchet Wheel 35. Said plate 40 is normally held in its central position by a spring bolt 43 against the action of which the plate may be moved to either side and by which the plate can be returned to its normal position.

By the means described:

(a) the presser foot may be allowed to be free at which time it may be raised by the operator by means of the handle referred to;

(b) the presser foot may be locked and then forcibly clamped on to the work to compress or consolidate the same during the formation of the stitch;

(c) the presser foot may be unclamped and lifted to permit the work feed to operate;

(d) the amount of the clamping action and the degree of lift is under the control of the operator.

When the ratchet wheel 35 is in position between the pawls so that neither pawl engages the teeth the operator can raise the presser by means of the handle provided for suchpurpose. \Vhen the arm 39 carrying the ratchet wheel 35 is moved in one direction one ofthe teeth immediately stops the further rota:

tion of said wheel 35 and the pinion 33 and lift'plus one'eighth or a quarter of an follows therefore that a 70 carried by a lever 71 on inch clamping movement set so that they only the' extremity of each stroke no lifting or clamping can occur, but only locking. It very simple, efficient and fine adjustment of the degreeof clamping and the amount of lift is obtainable and the pawls are ust make contact at by'merely adjusting the position of the pawls. For example if one pawl (say the right hand one) the ratchet wheel 35 so that this almost immediately engages the said ratchet wheel whenit is moved to the right, a clamping of approximately one eighth of an inch will' result.

A similar movement will result if the left hand pawl be similarly adjusted.

The take-111167 (see Figs. 4 and 5) is. mounted upon a rock shaft 68 having at its outer end an extension 69 with which a yoke a shaft 72 having another and cam operated lever 7 3 engages. The thread-shown in dotmnd-dash linescoming from the container or spool at the back of the machine passes over at tensioning wheel 74 and from this to a measuring 84; 8'5 hereinafter 82 on the shaft 34. A second link 7 8 off roll 75. Said roll is carried on one arm of a ball-crank 79 on one end of a rock shaft 7 6 which carries at its other end a lever 77 that is' connected by a link 78 to a crank pin also connected to said rock shaft 76. has a slotted end fitting a pin 80 on the take-up arm 67. From the measuring off roll 75 the thread passes vertically through a locking device described. lVhen the main take-up arm'67 descends to complete the stitch the thread is locked but the link 78 being operated by. the pin 80 pulls upon the ball-crank lever 79 causing a certain length of thread to be drawn off the tension wheel 74 ready for the next stitch.

The length of thread to be measured off is accurately determined by the thickness of the work-passing between the presser foot 28 and the table of the machine in the folver' 29 and when the pl'esser lowing manner z- The shaft 34; on which the ratchet wheel 35 referred to above is mounted is geared positively with the presser foot carrying lefoot owing to an increase in the thickness of the work is farther from the table the said shaft will pawls the is adjusted to be close up to also have changed its position and in such a manner that the crank pin 82 controlled by iti's made to operate the thread roll throughthe slotted link 7 8, lever 77 and a pin 7 7 which is carried by the said lever and is engaged in the slot in the said link, to set it in a'position corresponding with the thickness of the particular portion of the work on which the presser foot is acting. The arrangement and construction" of the parts are such that movement of the :roll 75 is not prevented and when therefore the main take-up 67 operatefsto actuate the roll 75 it only moves the latter for the remainder of the distance representing the difference between the full stroke of the pin on the take-up arm and the amount thatthe thread roll 75 has been permitted or' compelled-to rise by the increased thickness and thus the length of thread measured off is strictly proportional to the-thickness of the work if the parts are correctly proportioned in the firstinstance.

The thread is locked when the main takeup is about to act upon it by means of the locking device 'hereillbefore referred to consisting of a plunger 84-w01'ki11g in a tube 85 one end of which has a slot and an end portion 84* forming a face 85' betweenwhich and the endofthe plunger the thread is clamped, The plunger 84 is actuated to clamp and-unclanp the thread by a small lever 88 of approximate inverted T shape pivoted at 89, the cross bar ofiwhioh lever is engaged at its front end with the plunger 84: and at its rear end witha short lever 90 fixed upon avertical rock shaft '90? which carries at its upper end a cam lever 91 provided with a camroll 91f thatis operated by a cam on the main shaft. I preferably provide a spring 87 which acts upon the lever 88 to maintain the cam lever in contact-With its cam. V r V y The auxiliarvtake-up is carried on a rock shaft having a coil spring to maintain the of the work thread roll .5 n po i io aga ns t e 11 of a the thread by the main take up. 11 the thread controlling apparatus issupported on Prot cted by a hinge a bracket 97 and 1s door 98 normally held closed by a spring detent 100.

W t I claim as y to secure by Letters Patentis 1. In a sewing machin the combination with a workstable, forming mechanism, a take-up ilever, ,:and

of a presser-foot, stitchinvention and desire with stitch-forming mechanism, of a presser foot, thread measuring means, controlled by the presser foot, and means under the control of the operator to control the clamping force of the presser foot and the amount of the lift thereof.

3. In a sewing machine, the combination with a work table and a presser foot carried by a lever which is pivotally mounted on a horizontal axis and has a rearwardly extending arm, of means for raising the said presser foot by hand consisting of a gear segment on the said rearwardly extending arm and an actuating lever pivotally mounted on an axis arallel t0 the aforesaid axis and provided with a handle and a gear segment which meshes with the aforesaid gear segment, and means for alternately raising and depressing the said presser foot to an adjustable extent automatically, to permit the work to be fed and to exert a clamping force upon the work, the said means consisting of a second gear segment on the aforesaid actuating lever, a sleeve mounted loosely upon the axis of the said actuating Gopies of this patent may be obtained for lever, a lever arm fixed to the said sleeve and engaged with a cam operated lever by which the sleeve is oscillated through a fixed arc, a second arm fixed to said sleeve, a shaft rotatably carried by the said second arm, a pinion fixed on the said shaft and in gear with the said second gear segment on the actuating lever, and a locking device comprising a ratchet Wheel fixed on the pinion shaft, a plate pivotally mounted on the aforesaid sleeve and normally held in a nonoperative position by a sprinu bolt, and two pawls adjustably mounted on the said plateone at each side of the said ratchet wheel-and adapted to engage the said ratchet wheel alternately when the said sleeve is oscillated.

In testimony whereof I have signed my name to this specification in the presence of two subscribing witnesses.

MARK THOMAS DENNE.

five cents each, by addressing the Commissioner of latents, Washington, D. 0. 

